On Fri, Aug 22, 2008 at 3:14 PM, Andrew Pinski <[EMAIL PROTECTED]> wrote: > On Fri, Aug 22, 2008 at 2:47 PM, Niklaus <[EMAIL PROTECTED]> wrote: >> Hi, >> >> >> When i run with the options g++ prog.c -o prog and run the exectuable >> it gives me the correct output >> but when i do g++ prog.c -o prog -O2 i get the wrong output >>
Note by the way I think your ispow2 is incorrect. It is doing a "a == 1 & a != 0" and not ((a-1)&a) == 0. We do warn about this too: t.c:189: warning: suggest parentheses around comparison in operand of & -- Pinski
